How to password protect a PDF
Updated: · Agah Emre SÖZEN
Payslips, medical reports, contracts and client lists can end up with the wrong person when you email them. Encrypting the PDF stops anyone without the password from opening it. This guide shows how to add a password and how to share it safely.
Protect PDF
Try it now: free, no account, and your file never leaves your device.
Steps to add a password
- 1Open quillo.tr/protect-pdf and choose your PDF.
- 2Type an open password; we suggest at least 10 characters.
- 3Optionally turn off printing and text copying.
- 4Press Protect and download the encrypted PDF.
How to share the password
Don't put the password in the same email as the file. Send the file by email and the password by phone or a separate message. Keep your unprotected original: the password is stored nowhere, so it can't be recovered.
How secure is it?
uses AES-256. What really decides the security is the password's length: a short or guessable one, like a birth date, weakens even strong encryption.
Frequently asked questions
- Will it open on a phone?
- Yes, in any PDF reader that asks for a password: phone, computer or browser.
- Can I remove the password later?
- Yes. If you know it, quillo.tr/unlock-pdf saves an unlocked copy.
- Is it free?
- Yes. No sign-up and no limits.
Protect PDF
Try it now: free, no account, and your file never leaves your device.